Principal Infrastructure Engineer

DV Cleared Principal Platform Engineer
- Platform Security & Infrastructure

Location: Yeovil (Onsite)

Rate: £680 - £713 per day (Inside IR35)

Contract: 12 Months

Working Pattern: Full-time or condensed week available (work 3 long days and get paid for
5)

Security Clearance: Active UK Developed Vetting (DV) Clearance required

We're seeking an experienced DV Cleared Principal Platform Engineer to join a high-profile programme delivering secure, mission-critical platforms supporting defence, government, and national security operations.

This is an opportunity to work at the forefront of platform security, enterprise infrastructure, and cyber engineering
, taking ownership of complex technical challenges within highly secure environments. You'll play a key role in designing, integrating, and delivering resilient platforms that underpin critical operational capabilities.

For candidates seeking greater work-life flexibility, a condensed working pattern is available
, allowing you to work three extended days per week while being paid for a full five-day week
.

As a Principal Platform Engineer, you will act as a technical authority across platform engineering disciplines, combining hands‑on technical delivery with leadership, mentoring, and strategic input.

• Leading the design, implementation, and integration of secure platforms across on-premise, hybrid, and cloud environments.
• Capturing and analysing complex customer requirements to develop robust technical solutions.
• Producing high-level and detailed technical designs aligned to secure‑by‑design principles.
• Owning technical delivery across work packages, including planning, estimation, and reporting.
• Providing technical leadership, mentoring, and capability development within engineering teams.
• Driving innovation, automation, and continuous improvement initiatives.
• Integrating enterprise infrastructure, security, and identity services within complex environments.
• Engaging with stakeholders to present, justify, and deliver technical solutions.

• Windows and Linux operating systems.
• VMware and Hyper‑V virtualisation technologies.
• Software‑defined data centre architectures.
• VMware Cloud Foundation (VCF), including:
  • vSphere
  • vSAN
  • NSX‑T
  • Aria Suite
• Network virtualisation and micro‑segmentation.

• Privileged Access Management (Cyber Ark or equivalent).
• Secure credential storage, rotation, and access control.
• Public Key Infrastructure (PKI) design and implementation.
• Certificate life cycle management.
• Cryptographic principles and secure communications.

• Active Directory.
• Identity and access management solutions.
• Monitoring and SIEM platforms.
• Enterprise security service integration.

• TCP/IP, DNS, DHCP, and Firewall technologies.
• Automation and Scripting using:
  • Power Shell
  • Bash
  • Python
  • Ansible
  • Terraform
• Infrastructure as Code and platform automation.

• Cyber security controls and accreditation requirements.
• Systems engineering life cycle experience.
• Delivery within highly secure, air‑gapped, defence, or government environments.

• VMware Certified Advanced Professional (VCAP).
• AWS and Azure cloud platforms.
• Dev Sec Ops  and CI/CD pipelines.
• VxRail and hyper‑converged infrastructure.
• VMware Cloud Foundation life cycle automation.
• SIEM/SOC integration.
• Hardware Security Modules (HSMs), including Thales.
• Cross‑domain and secure communications environments.
• Kubernetes and Docker container platforms.

• Extensive experience delivering secure enterprise platforms.
• Strong technical leadership alongside hands‑on engineering capability.
• Excellent problem‑solving and stakeholder engagement skills.
• Experience operating within defence, government, or national security environments.
• Active UK DV Clearance.

If you're a technically strong, DV-cleared platform engineer looking for a long-term contract working on nationally significant programmes, we'd like to hear from you.